python基础简记2

运算符

1.算数运算符:+, -, *, /(正常数学的除法) , //(地板除) ,%(取余), **(指数)。
2.逻辑运算符:and ,or,!
3.比较运算符:==,>,<,>=,<=,!=

优先级:短路原则————and:若左式为False,则结果为False
            or:若左式为True,则结果为True

while 循环

语法:
    while(条件):

#例题:猜年龄while
age_of_princal = 56
guess_age = int(input(">>:"))
while age_of_princal != guess_age:
    if guess_age == age_of_princal:
        print("yes,you got it..")
    elif guess_age > age_of_princal:
        print("you guess big")
    else:
        print("your guess low")
    guess_age = int(input(">>:"))
print("end")

##指定长宽输出长方形:
height = int(input("hign:"))
weight = int(input("weight:"))
h=1
while h<=height:
    w=1
    while w<=weight:
        print("#",end="")
        w=w+1
    print("")
    h=h+1

占位符

   %d: d = digit数字
   %s:  s = string字符串
   %f:  f = float 浮点型
   

#格式化字符串输出
------
name = input("name:")
age = input("age:")
salary = input("salary:)

msg = '''
________ info of %s ________
name:%s
age:%d
salary:%d
________  end  ________
''' % (name,name,age,salary)

print(msg)

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转载自blog.csdn.net/baidu_18374165/article/details/81436569